From: "Lawrence F. London, Jr." <lflj@bellsouth.net>
To: permaculture <permaculture@lists.ibiblio.org>
Subject: [permaculture] FYI: Fwd: [SANET-MG] Breakdown of Phosphate in the soil
Date: Thu, 11 Nov 2010 18:49:20 -0500
-------- Original Message --------
Subject: [SANET-MG] Breakdown of Phsphate in the soil
Date: Thu, 11 Nov 2010 12:07:41 -0800
From: Carl DuPoldt <cdupoldt@YAHOO.COM>
To: SANET-MG@LISTS.IFAS.UFL.EDU
Technical Abstract: Inorganic and organic phosphates react strongly with soil constituents, resulting in relatively low
concentrations of soluble P in the soil solution. Multiple competing reactions are operating to regulate the
solution-phase concentration of P-containing organic substrates and the released phosphate for assimilation by microbes,
plants, or dispersal in the environment. In intensive agrosystems, external inputs of commercial fertilizers are often
required to attain sufficiency levels of plant-available P. In this chapter, we focus on the ligand exchange process
involved in the solubilization of organic P, a forerunner process crucial to the function of extracellular
phosphohydrolases in accessing the recalcitrant soil organic P pool. Plants and microorganisms have evolved and
developed multiple strategies to obtain needed P. In these strategies, frequent interweaving of biophysical and
biochemical processes are observed in the
mineralization of organic P forms. A fundamental reassessment of the biogeochemistry of P in the soil-water systems is
necessary to improve our understanding of the physical chemistry of charged surfaces and the role of organic ligands in
the turnover of stabilized organic P. Practical solutions to constraints to phosphohydrolases" activity are needed to
attain improved use efficiency of this non-renewable resource.
[permaculture] FYI: Fwd: [SANET-MG] Breakdown of Phosphate in the soil,
Lawrence F. London, Jr., 11/11/2010